| Lamp economy switch (slide) |
It reduces the light output of the lamp thus increasing the lamp life. |
| LCD |
"Liquid Crystal Display". A system made of thin glass panels filled inbetween with a layer of liquid crystal. Thanks to electric mains all points of this layer can be activated individually. The precision of the activation is decisive for the quality of the projected image. |
| LCoS |
"Liquid Crystal on Silicon". LCoS displays have the size of half of a thumb nail. Despite their small size LCoS displays have more than two million pixels and enable a resolution beyond UXGA (1600 x 1200 pixels). LCoS displays consist of three parts. A silicon film, on top comes a thin coating with liquid chrystals and an extremely thin glass panel. By means of a special mirror the light of the lamp is reflected onto the LCoS display where again every single crystal is aligned per voltage in such way that the required image is projected. |
| Lens shift |
The lens can be moved mechanically from the principal axis of a projector. Due to the change of the projection angle the keystone effect is minimising. The greater the angle, the higher the loss of light and the greater the image errors (cushion - or barrel distortions). |
| Line doubler |
Electronic device or circuit turning video signals (half images) coded by the interlaced scanning into full images. The Line Doubler removes the annoying line structure. The simpliest form doubles the provided lines. This results in homogeneous images. |
| Luminance factor (projection screen) |
The measure for the efficiency factor of a projection screen according to DIN 19045 part 4: The luminance factor indicates the reflected part of the incident light. Measuring method: A light reading unit is arranged in the height of the light source and calibrated with a standard surface (standard-white) to 1. The measuring is made on the centre axis. Then the standard surface is exchanged with the projection screen pattern: The light reading unit now indicates the luminance factor for the relevant projection screen area. The measuring is based on different standards in various countries. In principle, only those projection screens can be compared with each other which have been measured according to the same standard. Gainfactor |
